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Table 2 Corresponding relationship between cell proliferation percentage and cytotoxicity grade

From: In-vitro characterization and evaluation of mesoporous titanium dioxide composite hydroxyapatite and its effectiveness in occluding dentine tubules

RGR%

Cytotoxicity grade

≥ 100

Grade 0

75–99

Grade 1

50–74

Grade 2

25–49

Grade 3

0–24

Grade 4

0

Grade 5